The graphics below depict the latest trends in the GFS and NAM computer model forecasts over the past 12 hours. A slight westward shift in the surface low position is evident in both model solutions as seen below. This suggests an increased chance for precipitation over eastern Pennsylvania (versus 12 hours ago) as this storm system lifts northeast along the Mid-Atlantic coast.

However despite the higher probability of precipitation, there is still a good deal of uncertainty with regard to whether the precipitation will fall as rain or snow across the Lower Susquehanna Valley. The main factor at play here is a weak low pressure area located over the lower Great Lakes. This feature will keep the coldest air further to the west over the Upper Mississippi Valley.

Given the current surface low track, a several-inch snowfall is a low probability event across eastern Pennsylvania - but still cannot be ruled out.

This page will be updated early tomorrow morning. Until then, stay tuned to the latest forecast products from the National Weather Service in State College.